Nothing is deleted, not even the registry. The registry ill be re-constructed which hopefully will sort out any problems you may have. A lot of stuff that was there previously will still be there at the end of the repair install. A the end of it you should have everything you had at the beginning but working properly.

But be aware, the problem that prompted the repair install may not be eliminated but a repair install is a good place to start.

The only way to do that is to format the drive & do a clean install of XP.

How about stating the problem or problems you're having that prompted this repair installation?

You cannot delete the registry but you can clean it & there are a number of free programs available for that. CCleaner Slim (without the Yahoo Toolbar spyware) & Glary Utilities are two that will clean the registry along with all the accumulated garbage files.

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